So far I haven’t noticed any limitations, but I only use it infrequently (at most once or twice a week to watch an episode or two of a show together).

So YMMV, not sure how much you typically stream. I guess you could always have the other person manually set a lower quality so less data is being sent if you run into issues. The price of them not installing Tailscale!

Something I do is use a Tailscale Funnel to share a regular link with friends and family and it works well, without them needing an account.

Do we know much about how many parts of the 12 are shared with the 13? I wonder if they’d use the same keyboard, battery, etc.